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Finding the Fourth Proportional to 138,690.47, 207,910.86 and 49,881.56

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Solution

The fourth proportional to 138,690.47, 207,910.86 and 49,881.56 is: 74,777.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,690.47 : 207,910.86 = 49,881.56 : x
  2. Step 2: Convert to fraction form
    138,690.47/207,910.86 = 49,881.56/x
  3. Step 3: Cross multiply
    138,690.47x = 207,910.86 × 49,881.56
  4. Step 4: Simplify right side
    138,690.47x = 10,370,918,557.52
  5. Step 5: Solve for x
    x = 10,370,918,557.52/138,690.47
  6. Step 6: Final answer
    x = 74,777.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.